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English definition of “right-angled triangle”

right-angled triangle

noun [C]   /ˌraɪt.æŋ.ɡl̩dˈtraɪ.æŋ.ɡl̩/ UK (US right triangle)
a triangle that has one angle of 90°Geometrical shapesSpherical, circular and annular objects
(Definition of right-angled triangle noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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